Oral cavity/Skull Development

Question 1

masticatory mucosa

Answer 1

• stratified squamous keratinized or parakaritinized epitheliuim
• bound tightly to underlying bone
• covers gingiva and hard palate

Question 2

lining mucosa

Answer 2

• startified squamous non keratinized epithelium
• covers inner surface of lips, cheeks, soft palate, inferior surface of tongue, floor of mouth
• CT has elastic fibers

Question 3

specialized mucosa

Answer 3

top of tongue (also on palate, oropharynx and epigloottis)

includes taste buds/papillae

Question 4

4 types of papillae and location

Answer 4

• Filiform: no taste buds
• Fungiform: taste buds on apical surface
• Circumvallate: taste buds on lateral surface
• Foliate: taste buds lateral

Question 5

when do taste buds first appear in development

Answer 5

end of week 8 (callate and foliate)

development during week 10-11

fetal response to bitter @ 26 weeks

Question 6

junctional epithelium

Answer 6

• gingiva of sulcus
• adheres to tooth cia hemidesmosomes
• IBL binds to calcified tissue
• basal cells rest of a typical basal lamina (EBL)
• jxn of epithelium and tooth is permeable

Question 7

principle fiber type of PDL

Answer 7

type I collagen

Question 8

unique features PDL

Answer 8

highly cellular

rich blood supply

highly innervated

high turnover of collagen fibers

Question 9

merocrine secretion

Answer 9

secretory product released in membrane bound vesicles

Question 10

when does parotid gland develop

Answer 10

week 4-6 (until 2 years postnatally)

Question 11

when does submandibular gland develop

Answer 11

week 6 (until 2 years postnatally)

Question 12

when do sublingual and minor salivary glands develop

Answer 12

weeks 8-12 (until 2 years postnatally)

Question 13

what secretion do von ebners glands produce

Answer 13

serous saliva only

Question 14

what does neurocranium develop from

Answer 14

cranial vault/calvaria: intramembranous bone of NCC and paraxial mesoderm

cranial base: endochondreal bone of NCC and paraxial mesoderm

Question 15

what does viserocranium arise from

Answer 15

intramembranous bone of NCC

Question 16

masticatory apparatus arises from what

Answer 16

intramembranous ossification for jaw bones

Question 17

membranous neurocranium includes what bones

Answer 17

frontal, parietal, squamous temporal and interpatietal part of occipital

Question 18

when does frontal bone develop

Answer 18

week 7

Question 19

when does frontal suture fuse/dissapear

Answer 19

fused by 9 months post natal, gone by age 6-7

Question 20

what are sagittal and coronal suture made from

Answer 20

sagittal: NCC
coronal: paraxial mesoderm

Question 21

fontanelles

Answer 21

wide sutures where more than 2 bones meet

allow bones to overlap during birth

Question 22

chondrocranium includes

Answer 22

occipital, sphenoid, ethmoid, petrous and mastoid part of temporal bone

Question 23

cartilaginous viscerocranium from pharyngeal arch 1

Answer 23

meckel’s cartilage, malleus, incus

Question 24

cartilaginous viscerocranium from pharyngeal arch 2

Answer 24

reichert’s cartilage, stapes, styloid process